Method for isolating an aqueous hydrochloric acid solution of fecl3 from an aqueous multi-component system

Patent metadata

Field	Value
Publication number	US-2023391634-A1
Application number	US-202218278724-A
Country	US
Kind code	A1
Filing date	Feb 21, 2022
Priority date	Feb 24, 2021
Publication date	Dec 7, 2023
Grant date	—

Abstract

The invention relates to a method for isolating an aqueous hydrochloric acid solution of FeCl 3 from an aqueous multi-component system.

First claim

1 . Method for isolating an aqueous hydrochloric acid solution of FeCl 3 from an aqueous multi-component system, comprising the following steps:
a) an aqueous hydrochloric acid multi-component system comprising Fe 3+ ions is provided, b) the multi-component system from step a) is extracted with an organic solvent, c) the organic solvent from step b) is extracted with water, wherein the aqueous hydrochloric acid solution of FeCl 3 is obtained, characterized in that in the multi-component system of step a), the molar ratio of aqueous HCl to Fe 3+ ions is ≥1.3:1.

2 . Method according to claim 1 , characterized in that the molar ratio of aqueous HCl to Fe 3+ ions is in the range from 1.5:1 to 2.5:1 and preferably in the range from 1.8:1 to 2.3:1.

3 . Method according to either of claim 1 or 2 , characterized in that the organic solvent comprises or consists of molecules comprising heteroatoms, preferably oxygen, sulfur or nitrogen atoms and particularly preferably oxygen atoms.

4 . Method according to either of claim 1 or 2 , characterized in that the organic solvent comprises or consists of one or more of the following organic solvents: ethers, alcohols, ketones, and preferably comprises or consists of one or more of the following organic solvents: 2-methoxy-2-methylpropane, diisopropyl ether, butanol, 2-methyl-1-propanol, 2-ethylhexan-1-ol, 4-methylpentan-2-one, 1-chloro-4-methylpentan-2-one, 3-chloro-4-methylpentan-2-one.

5 . Method according to either of claim 1 or 2 , characterized in that the organic solvent comprises or consists of 4-methylpentan-2-one.

6 . Method according to any of claims 1 to 5 , characterized in that the extraction in step b) is carried out with the organic solvent in countercurrent.

7 . Method according to any of claims 1 to 6 , characterized in that the extraction in step b) is a multi-stage extraction, preferably in 3 to 7 stages.

8 . Method according to any of claims 1 to 7 , characterized in that the extraction in step c) is carried out with water in countercurrent.

9 . Method according to any of claims 1 to 8 , characterized in that the extraction in step c) is a multi-stage extraction, preferably in 2 to 7 stages.

10 . Method according to any of claims 1 to 9 , characterized in that the method is carried out at a temperature in the range of 0 to 80° C., preferably in the range of 10 to 50° C. and particularly preferably in the range of 20 to 40° C.

11 . Method according to any of claims 1 to 10 , characterized in that said method is carried out continuously.

12 . Method according to claim 11 , characterized in that the organic solvent after the extraction with water in step c) is reused in step b).

13 . Method according to any of claims 1 to 12 , characterized in that the concentration of Fe 3+ ions in the aqueous multi-component system of step a) is in the range of 0.01 to 2.3 mol/kg, preferably in the range of 0.1 to 2 mol/kg and particularly preferably in the range of 1.1 to 1.7 mol/kg.

14 . Method according to any of claims 1 to 13 , characterized in that the aqueous multi-component system of step a) comprises dissolved alkali metal salts and/or alkaline earth metal salts and preferably NaCl and/or NaSCN.

15 . Method according to claim 14 , characterized in that the aqueous multi-component system of step a) comprises dissolved NaCl in the range of 0.01 to 3.5 mol/kg, preferably in the range of 0.1 to 1.5 mol/kg and particularly preferably in the range of 0.3 to 1 mol/kg.

Assignees

• Bayer Ag

Inventors

• Esser Michael
• Peper Stephanie
• Becker Karsten
• Bäcker Werner

Classifications

• C01G49/0009 Primary

  Preparation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title

• C01G49/10

  Halides {(C01G49/0018 takes precedence)} · CPC title

• C22B3/262

  using alcohols or phenols · CPC title

• C22B3/302

  Ethers or epoxides · CPC title

• C22B3/306

  Ketones or aldehydes · CPC title